HAL810
Programmable Linear Hall-Effect Sensor
Release Note: Revision bars indicate significant
changes to the previous edition.
DATA SHEET
age of typically 5 V in the ambient temperature range
from
−
40 °C up to 150 °C. The HAL810 is available in
the very small leaded packages TO92UT-1 and
TO92UT-2.
1. Introduction
The HAL810 is a member of the Micronas family of
programmable linear Hall sensors. The linear output is
provided as the duty cycle of a pulse-width modulated
output signal (PWM signal).
The HAL810 is a universal magnetic field sensor with
a linear output based on the Hall effect. The IC is
designed and produced in sub-micron CMOS technol-
ogy and can be used for angle or distance measure-
ments if combined with a rotating or moving magnet.
The major characteristics, such as magnetic field
range, sensitivity, output quiescent signal (output duty
cycle at B = 0 mT), and output duty cycle range are
programmable in a non-volatile memory.
The HAL810 features a temperature-compensated
Hall plate with choppered offset compensation, an A/D
converter, digital signal processing, an EEPROM
memory with redundancy and lock function for the cali-
bration data, a serial interface for programming the
EEPROM, and protection devices at all pins. The inter-
nal digital signal processing is of great benefit as ana-
log offsets, temperature shifts, and mechanical stress
do not lower the sensor accuracy.
The HAL810 is programmable by modulating the sup-
ply voltage. No additional programming pin is needed.
The easy programmability allows a 2-point calibration
by adjusting the output signal directly to the input sig-
nal (like mechanical angle, distance, or current). Indi-
vidual adjustment of each sensor during the cus-
tomer’s manufacturing process is possible. With this
calibration procedure, the tolerances of the sensor, the
magnet, and the mechanical positioning can be com-
pensated in the final assembly. This offers a low-cost
alternative for all applications that presently need
mechanical adjustment or laser trimming for calibrating
the system.
In addition, the temperature compensation of the Hall
IC can be suited to all common magnetic materials by
programming first and second order temperature coef-
ficients of the Hall sensor sensitivity. This enables
operation over the full temperature range with high
accuracy.
The calculation of the individual sensor characteristics
and the programming of the EEPROM memory can
easily be done with a PC and the application kit from
Micronas.
The sensor is designed for hostile industrial and auto-
motive applications and operates with a supply volt-
1.1. Major Applications
Due to the sensor’s versatile programming character-
istics, the HAL810 is the optimal system solution for
applications such as:
– contactless potentiometers,
– rotary sensors,
– distance measurements,
– magnetic field and current measurement.
1.2. Features
– high-precision linear Hall effect sensor with digital
signal processing
– PWM output signal with a refresh rate of typically
125 Hz and up to 11 bit resolution
– multiple programmable magnetic characteristics in a
non-volatile memory (EEPROM) with redundancy
and lock function
– open-circuit feature (ground and supply line break
detection)
– temperature characteristics programmable for
matching all common magnetic materials
– programmable clamping function
– programming via modulation of the supply voltage
– operation from
−40
°C up to 150 °C ambient tem-
perature
– operation with 4.5 V to 5.5 V supply voltage in spec-
ification and functions with up to 8.5 V
– operation with static magnetic fields and dynamic
magnetic fields
– overvoltage and reverse-voltage protection at all
pins
– magnetic characteristics extremely robust against
mechanical stress
– short-circuit protected push-pull output
– EMC and ESD optimized design
4
Feb. 6, 2009; DSH000034_003EN
Micronas
MICRONAS [ MICRONAS ]
